The American foreign policy of "flexible response"
The American foreign policy of "flexible response" altered an earlier strategy of mainly relying on these weapons to prevent an attack. That strategy was based on the threat of massive retaliation. A briefcase known as the "football" contains the codes for these weapons, which are often launched from ICBMs. For 10 points, name this type of weapons that caused Japan to surrender in World War II after being dropped on Hiroshima and Nagasaki.
The American foreign policy of "flexible response" altered an earlier strategy of mainly relying on these weapons to prevent an attack.
{nuclear} weapons [or equivalents such as {atomic bombs}]